Blister rust in large white pine. Tree seed plant Angus.

Blister rust in large white pine. Tree seed plant Angus

Blister rust(Cronartium ribicola) in planted white pine. Infection was most probably in the nursery. Owen Sound MNR

Blister rust (Cronartium ribicola) aeciospores on 9 year old white pine. Leslie Frost Centre.

Blister rust (Cronartium ribicola) aeciospores on 9 year old white pine. Leslie Frost Centre.

Blake MacDonald's experiment to show the impact of water supply: weekly vs. fortnightly watering on growth of hard maple seedlings.

Blake MacDonald's experiment to show the impact of water supply: weekly vs. fortnightly watering on growth of hard maple seedlings.

Blade scarification using D8; 2-3 acres/hour. N.B. frozen soil under where blade is scraping. Northwestern Pulp & Power. Hinton

Blacksmith working on horseshoe.

Same as slide #1428. Prescribed burn planted to spruces, Fall 1970. Aerial herbicide (2lb./acre, 24D) in 1977. Longlac.